Quotes About Logic

He had an early formulation of what in the Tractatus he saw more clearly — that we can speak of existence only when we assert the truth of some proposition that is not itself existential.

So Wittgenstein went to Trinity College, Cambridge, to study under Bertrand Russell (1872-1970) who was a lecturer in mathematical logic. This was to lead to a passionate intellectual friendship between these two great philosophers in which both were transformed.

The struggle is lost from the beginning, long before the victorious party or army conquers state power and 'betrays' its promises. It is lost once power itself seeps into the struggle, once the logic of power becomes the logic of the revolutionary process, once the negative of refusal is converted into the positive of power-building.

The great danger in the South comes precisely from the fact that the public is not informed. Newspapers shirk notoriously their editorial responsibilities and print what they think their readers want. They lean with the prevailing winds and employ every fallacy of logic in order to editorialize harmoniously with popular prejudices.

We aren't eccentric, we're not bizarre. To each other, we're as normal and nice as the smell of bread, we were just a family. In a family, even exaggerations make perfect sense; they are always logical exaggerations, nothing more.

It would always amaze me, how Frank could make pure idiocy sound logical.

For axioms in philosophy are not axioms until they are proved upon our pulses.

Her logic was a combination of half-truths and clichés, her worldview a compound of misconceptions deriving from a history of our nation as written from the perspective of a subway tunnel.

In the world of minor lunacy, the behavior of both the utterly rational and the totally insane seems equally odd.

Biological systems are the product not of logic but of evolution, an inelegant process. Life does not choose the logically best design to meet a new situation. It adapts what already exists. Much of the human genome includes genes which are "conserved"; i.e., which are essentially the same as those in much simpler species. Evolution has built upon what already exists.

The chief enemy of progress, ironically, became pure reason.

In fact, biology is chaos. Biological systems are the product not of logic but of evolution, an inelegant process.

feeling was an integral component of the machinery of reason.

It can be of no practical use to know that Pi is irrational, but if we can know, it surely would be intolerable not to know.

Logic is not only an exact science, but is the most simple and elementary of all sciences; it ought therefore undoubtedly to find some place in every course of education.

Believe it or not, philosophy has consequences.

The essential difference between emotion and reason is that emotion leads to action while reason leads to conclusions.

I'm not emotional about investments. Investing is something where you have to be purely rational and not let emotion affect your decision making - just the facts.

Emotions have taught mankind to reason.

It is reason, and not passion, which must guide our deliberations, guide our debate, and guide our decision.

Since when was an emotional argument won by logic?

(He was) a fragile hero to whom we had an emotional attachment so strong and lasting that it defied logic.

I write emotional algebra.

You are 100% emotional in everything you think, feel and decide. You decide emotionally and justify logically.